IP3 optimization on an amplifier

Thread Starter


Joined Nov 1, 2018

I have designed an amplifier for FM band (87.5-108 MHz) with a good IP3 (+64 dBm) but now my goal is to increase the IP3 to +70 dBm.

My amplifier use two transistor in push-pull, a MRF136Y and a D1008UK with a ferrite transformer before the MRF136Y, a coax transformer between both, and a coax transformer and a coax balun after the D1008UK. I have used coax transformer to get a good IP3 in all FM band and to potentialy use this amplifier in other band.

I'm looking for basic advice, about design of an amplifier with good IP3.


Joined Sep 22, 2013
Do you have to stay with that circuit? I recommend the Tayloe detector/mixer.....or what ever you want to call it.

It's simple and low component count.....but needs a high frequency local oscillator.

The specs are impressive. Tayloe Mixer. But is really a simple switch.